Report a compiling error with old GCC version (GCC 4.8.5)

[wayne]

I try to apply dbg-macro to my old project, using gcc 4.8.5 to compile the code, but failed. In error message, I guess maybe is SFINAE fialed, then follow the guide from https://en.cppreference.com/w/cpp/types/void_t

I use the

template<typename... Ts>
struct make_void { typedef void type; };
 
template<typename... Ts>
using void_t = typename make_void<Ts...>::type;

to replace the definition in dbg.h's, then every thing is OK.

template <typename...>
using void_t = void;

I report this compiling error here, if some one have same problem, may this can be a help. :-D

[David Peter]

Thank you.